Vitamin C 1000mg - Dietary Supplement that comes in tablets that contain 1000 mg of Vitamin C. helps to maintain the normal functioning of the immune system. One of its very important functions is to keep collagen in action, a protein necessary for the formation of connective tissue in the skin, ligaments and bones. It also contributes to the formation of red blood cells and prevents bleeding. It also fights bacterial infections and reduces the effects of certain substances that cause allergies. For these reasons, vitamin C is often used in the prevention and treatment of the common cold.